Abstract

A visual adaptometer which employs a direct mechanical linkage between brightness-control mechanism and recorder is described. Brightness of the test field, which is controlled by the subject, is not uniform, one-half being darker than the other by a small fixed amount. The subject’s visual threshold is approximated by requiring him to adjust the brightness of the split field so that he is able to see only the brighter portion of it. The device may be operated by the subject with little or no assistance from the experimenter and yields a nearly continuous plot of absolute visual threshold as a function of time.

© 1954 Optical Society of America

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